package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.HashMap;
import java.util.UUID;

/**
 * 文件的上传和下载
 */
@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();//例如abc.jpg
        //取原始文件名后缀
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));


        //使用uuid生成不重复的文件名，防止覆盖
        String fileName = UUID.randomUUID().toString() + suffix;

        //创建目录对象
        File dir =new File(basePath);
        //判断当前目录是否存在
        if(!dir.exists()) {
            dir.mkdir();
        }

        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }


        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            //通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));

            //通过输出流将文件写回浏览器，在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];

            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            outputStream.close();
            fileInputStream.close();


        } catch (Exception e) {
            e.printStackTrace();
        }



    }
}
